Observational constraints for C-rich AGB stars
- Autor(en)
- Gioia Rau, Josef Hron, Claudia Paladini, Bernhard Aringer, Paola Marigo, Kjell Eriksson
- Abstrakt
We modeled the atmospheres of six carbon-rich Asymptotic Giant Branch stars (R Lep, R Vol, Y Pav, AQ Sgr, U Hya, and X TrA) using VLTI/MIDI interferometric observations, together with spectro-photometric data, we compared them with self-consistent, dynamic model atmospheres. The results show that the models can reproduce the Spectral Energy Distribution (SED) data well at wavelengths longer than 1 mu m, and the interferometric observations between 8 mu m and 10 mu m. We found differences at wavelengths shorter than 1 mu m in the SED, and longer than 10 mu m in the visibilities. The discrepancies observed can be explained in terms of a combination of data- and model-related reasons. We derived some stellar parameters, and our findings agree well with literature values within the uncertainties. Also, when comparing the location of the stars in the H-R diagram, with evolutionary tracks, the results show that the main derived properties (L, Teff, C/O ratios and stellar masses) from the model fitting are in good agreement with TP-AGB evolutionary calculations.
- Organisation(en)
- Institut für Astrophysik
- Externe Organisation(en)
- Université Libre de Bruxelles, INAF - Osservatorio Astronomico di Padova
- Journal
- Memorie Societa Astronomica Italiana
- Band
- 88
- Seiten
- 455-458
- Anzahl der Seiten
- 4
- ISSN
- 0037-8720
- Publikationsdatum
- 01-2017
- Peer-reviewed
- Ja
- ÖFOS 2012
- 103003 Astronomie, 103004 Astrophysik
- Link zum Portal
- https://ucrisportal.univie.ac.at/de/publications/6c0dce4f-fa78-4a95-9dff-fe6790776af2